add ai feature

internal/ai/client.go

@@ -0,0 +1,59 @@
+package ai
+
+import (
+    "context"
+    "errors"
+
+    "github.com/rogeecn/renamer/internal/ai/flow"
+)
+
+// Runner executes the rename flow and returns structured suggestions.
+type Runner func(ctx context.Context, input *flow.RenameFlowInput) (*flow.Output, error)
+
+// Client orchestrates flow invocation for callers such as the CLI command.
+type Client struct {
+	runner Runner
+}
+
+// ClientOption customises the AI client behaviour.
+type ClientOption func(*Client)
+
+// WithRunner overrides the flow runner implementation (useful for tests).
+func WithRunner(r Runner) ClientOption {
+	return func(c *Client) {
+		c.runner = r
+	}
+}
+
+// NewClient constructs a Client with the default Genkit-backed runner.
+func NewClient(opts ...ClientOption) *Client {
+    client := &Client{}
+    client.runner = func(ctx context.Context, input *flow.RenameFlowInput) (*flow.Output, error) {
+        creds, err := LoadCredentials()
+        if err != nil {
+            return nil, err
+        }
+        return runRenameFlow(ctx, input, creds)
+    }
+    for _, opt := range opts {
+        opt(client)
+    }
+    return client
+}
+
+// Suggest executes the rename flow and returns structured suggestions.
+func (c *Client) Suggest(ctx context.Context, input *flow.RenameFlowInput) (*flow.Output, error) {
+	if c == nil {
+		return nil, ErrClientNotInitialized
+	}
+	if c.runner == nil {
+		return nil, ErrRunnerNotConfigured
+	}
+	return c.runner(ctx, input)
+}
+
+// ErrClientNotInitialized indicates the client receiver was nil.
+var ErrClientNotInitialized = errors.New("ai client not initialized")
+
+// ErrRunnerNotConfigured indicates the client runner is missing.
+var ErrRunnerNotConfigured = errors.New("ai client runner not configured")